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[code]
#!/usr/bin/python
import sys, os, re
import pickle as p
class address:
    def __init__(self,name,email,telephone):
        self.name = name
        self.email = email
        self.telephone = telephone
    def edit(self,new_name,new_email,new_telephone):
        if len(new_name) != 0:
            self.name = new_name
        if len(new_email) != 0:
            self.email = new_email
        if len(new_telephone) != 0:
            self.telephone = new_telephone
if os.path.exists('address.data'):
    f = file('address.data')
    d_book = p.load(f)
else:
    d_book = {}
#print the menu
def printmenu():
    print '-----------------'
    print '''1.append
2.edit
3.delete
4.find
5.exit
6.print '''
    print '-----------------'
    s = raw_input('please input your choice(1-6):')
    return s
while True:
    ans_ = printmenu()
    if ans_ == '1':
        print 'you will append an item.'
        name = raw_input ('please input name:')
        if name in d_book:
            print '%s exists, please append a new one.' % name
        else: